Interesting article by Stephen D. Bartlett at the Clipper Group about running Blockchain on the mainframe: IBM’s Blockchain Initiatives — More Secure with Mainframe Systems.

How IBM Mainframes Support the Blockchain Process Model
The assurance of a secure environment and very fast and efficient cryptographic processing are essential elements of the Blockchain model. It can be strongly argued that IBM mainframe security technologies, particularly those embodied in the latest generation of z Systems, the z13 , z13s and LinuxONE family, are the “gold standard” for the IT industry with respect to these important requirements.